False-positive results for amphetamine and methamphetamine were the most commonly reported. False-positive results for methadone, opioids, phencyclidine, barbiturates, cannabinoids, and benzodiazepines were also reported in patients taking commonly used medications. Urine opiate screening: false-positive

department for screening of the urine for substances of abuse. These immu-. Dextromethorphan can also produce a false positive PCP in the urine. Of note,. confirmatory testing on positive PCP specimens. January 2014. Drug.

False-positive reports on urine drug screens by immunoassay are rare. The TABLE lists some of the substances reported to cause false-positive results. Urine drug screens are generally performed using either immunoassays or gas chromatography-.

Q: Can you explain the reason for a false-positive urine drug screen for marijuana? A: In 2013, an estimated 19.8 million Americans aged 12 years or older were . Numerous medications and other substances can

Unusual false-positive case of urinary screening for buprenorphine.. for the management of opioid dependence and as an analgesic drug for the treatment of chronic pain.. Buprenorphine/analogs & derivatives; Buprenorphine/urine* . Like all immunoassays, it can